Suppose there exists a chamber of practical size (perhaps a prism with a square-base of 10 inch size, and 25 inch height). Now suppose I place an open jar into the chamber. If (and I say 'if' because i don't know how one would do this) a machine sucked all the air from the chamber, would there exist a 'vacuum' inside the chamber? If so, would placing a lid on the jar cause the lid to 'stick' to the jar's top because of difference in air pressure? Please explain these concepts to me. Also, If my previous statements are true, what are the consequences (if any) of opening up this chamber after the procedure?